We bought our platform, but not before looking at many others' tools. Here are the ones I know of:
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Jive Software's Clearspace (internal) and Clearspace Community (external). This is the one we purchased and use. Great functionality and flexibility.
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Customer Vision's BizWiki is another great tool. The company has saved A TON of money and headaches for a number of other companies and has white papers about it.
- I saw
Mzinga's solution at a couple learning conferences recently. I haven't really checked it out, but from what I can tell, it seems pretty robust.
-IBM has
a number of tools I have seen demo'd that look pretty good, although I have never tried any of them myself.
- A joint effort between Intel and Spikesource,
SuiteTwo combines the best of the best together.
There are others that are more standalone, like Newsgator and SocialText, but I have focused on the all-encompassing suites that aid Social Learning.
Anyone have any more?